On Sat, 16 Aug 2008 01:53:06 -0600, Hans Hagen <[EMAIL PROTECTED]> wrote:
> Khaled Hosny wrote: >> Unicode has many "control characters" that only control text behaviour >> and shouldn't be rendered visually in the text, such as Bidi_Control and >> Join_Control chars (see >> http://www.unicode.org/Public/5.1.0/ucd/PropList.txt and >> http://unicode.org/Public/UNIDATA/UCD.html) >> Currently, ConTeXt handles ZWJ and ZWNJ, but other characters get >> rendered if the font has glyphs for them or make no effect at all if the >> font has no glyphs for them. I think that the optimum behaviour is to >> make those characters affect text formatting while not visually rendered >> whether the font has glyphs for them or not. >> It might be also useful if we can enable rendering those characters >> manually, for drafts and such. > > actually we need: > > - ignore them (like in verbatim) Eventually we want to be able to show them in verbatim also (provided the font has them). Indeed, I suggest that -- given an appropriate teletype font -- the default for _verbatim text_ should be to _show_ the control chars. > - act upon them > > and > > - show them (might somehow interfere with other things) Showing the control chars in typeset text -- non-verbatim -- should be rare; more appropriate for verbatim > - hide them I suggest that the default for _typeset text_ should definitely be to _hide_ the control chars. > if i'm right, when bidi is turned on, those chars get processed and then > discarded from the node list, so some more than zwj and zwnj is handled, It appears to me that zwj and zwnj etc. should be invisible in typeset-text output -- as explained above, but should still be encoded in the output pdf. Think pdf-text extraction, converting between Arabic and Farsi typesetting conventions, etc. > and of course others need to be handled as well Even lsep's and psep's should be present in the output pdf (eg \par => psep). Will make text extraction much more useful, etc. Best wishes Idris -- Professor Idris Samawi Hamid, Editor-in-Chief International Journal of Shi`i Studies Department of Philosophy Colorado State University Fort Collins, CO 80523 ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : [email protected] / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________
